Using LA-ICPMS Mapping and Sector Zonation to Understand Growth and Trace-Element Partitioning in Sector-Zoned Clinopyroxene Oikocrysts from the Norra Ulvo Gabbro, Sweden |
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Authors: | Claeson, D. T. Meurer, W. P. Hogmalm, K. J. Larson, S.-A. |
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Affiliation: | 1Geological Survey of Sweden, Kiliansgatan 10, SE-223 50 Lund, Sweden 2Exxonmobil Upstream Research Company, P.O. Box 2189, Houston, TX 77252-2189, USA 3Earth Sciences Centre, Göteborg University, Box 460, SE-405 30 Göteborg, Sweden |
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Abstract: | Petrographic analysis and geochemical mapping are used to characterizesector-zoned clinopyroxene oikocrysts from the Norra UlvöGabbro, Sweden. The sector zones are distinguished opticallyand by differences in TiO2 , Al2O3 , and incompatible traceelements. The oikocrysts grew with a branching morphology asevidenced by numerous triple points in a single oikocryst. Oikocrystsgrew from the center of domains outward and the growth withinindividual domains did not completely fill the space until theoikocryst had reached its full size. In some domains sectorzones are overgrown by growth zones that lack sectors. The lastcrystallization infilled channels that allowed late-stage liquidsto move through the oikocryst at the contacts with chadacrysts.Calculation of partitioning behavior of trace elements betweenadjacent sectors shows it to be regular and consistent withexperimental results. The data show that the CaTiAl2O6 componentgreatly enhances the solubility of most incompatible elementsin clinopyroxene. KEY WORDS: cumulate; layered intrusion; oikocryst; sector-zoned; trace elements |
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Keywords: | : cumulate layered intrusion oikocryst sector-zoned trace elements |
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